Correct Answer: She said to her mother, “Why are you so upset today?”

Solution : The third option is the correct answer.

Narration Conversion:

• The reporting verb said is used in place of asked in the direct speech.
• She remains the same, as the subject pronoun is retained.
• The third-person pronoun her changes to the first-person pronoun you in the direct speech.
• The simple past tense (was) is changed to the simple present tense (are) in the quoted words.
• That day becomes today in direct speech.
• The interrogative statement is enclosed in the quotation words.

Therefore, the correct sentence is: She said to her mother, 'Why are you so upset today?'